I was JUST entering my undergrad as an astronomer when Pluto's planetary-rank was reclassified to 'dwarf.' At the time, I only thought about it in passing. It read a bit about it, but it really didn't matter to me. Perhaps I was trying desperately to focus on my physics courses that items such as Pluto weren't high priority.Here's a new blog post on 'The Pluto Files' by Dr. Tyson